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NXP Semiconductors
PCU9955
16-channel UFm I 2 C-bus 57 mA constant current LED driver
slave address
W (write only)
1
1
0
A3
A2
A1
A0
0
Fig 3.
fixed
PCU9955 slave address
hardware selectable
002aaf095
The last bit of the address byte defines the operation to be performed. Only writes to
PCU9955 are supported, therefore the last bit is set to 0.
7.1.2 LED All Call I 2 C-bus address
? Default power-up value (ALLCALLADR register): E0h or 1110 000X
? Programmable through I 2 C-bus (volatile programming)
? At power-up, LED All Call I 2 C-bus address is enabled.
See Section 7.3.10 “ ALLCALLADR, LED All Call I 2 C-bus address ” for more detail.
Remark: The default LED All Call I 2 C-bus address (E0h or 1110 000X) must not be used
as a regular I 2 C-bus slave address since this address is enabled at power-up. All of the
PCU9955s on the UFm I 2 C-bus will respond to the address if sent by the I 2 C-bus master.
7.1.3 LED bit Sub Call I 2 C-bus addresses
? 3 different I 2 C-bus addresses can be used
? Default power-up values:
– SUBADR1 register: ECh or 1110 110X
– SUBADR2 register: ECh or 1110 110X
– SUBADR3 register: ECh or 1110 110X
? Programmable through UFm I 2 C-bus (volatile programming)
? At power-up, SUBADR1 is enabled while SUBADR2 and SUBADR3 I 2 C-bus
addresses are disabled.
Remark: At power-up SUBADR1 identifies this device as a 16-channel driver.
See Section 7.3.9 “ LED bit Sub Call I 2 C-bus addresses for PCU9955 ” for more detail.
7.2 Control register
Following the slave address, LED All Call address or LED Sub Call address, the bus
master will send a byte to the PCU9955, which will be stored in the Control register.
The lowest 7 bits are used as a pointer to determine which register will be accessed
(D[6:0]). The highest bit is used as Auto-Increment Flag (AIF). The AIF is active by default
at power-up.
This bit along with the MODE1 register bit 5 and bit 6 provide the Auto-Increment feature.
PCU9955
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 2 October 2012
? NXP B.V. 2012. All rights reserved.
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